试用雷利法分析水泵功率的关系式。实验得出,水泵功率N与水的重度,水头H和流量Q有关。
参考答案:
答案:
While he was in Beijing, he spent all his time ______ some important museums and buildings.
A.visiting
B.traveling
C.watching
D.touring
长时间高温下作业大量出汗会导致
A.等渗性脱水B.高渗性脱水C.低渗性脱水D.低钙E.低钠